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New mouse model of underactive bladder developed by placement of a metal ring around the bladder neck
Author(s) -
Eljamal Kareman,
Kajioka Shunichi,
Maki Tomoko,
Ushijima Miho,
Kawagoe Kentaro,
Lee Ken,
Sasaguri Toshiyuki
Publication year - 2021
Publication title -
luts: lower urinary tract symptoms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.451
H-Index - 15
eISSN - 1757-5672
pISSN - 1757-5664
DOI - 10.1111/luts.12359
Subject(s) - cystometry , bladder outlet obstruction , urination , urology , medicine , neck of urinary bladder , urinary bladder neck obstruction , anatomy , urinary bladder , urinary system , prostate , cancer
Abstract Objective To develop a new mouse model of underactive bladder (UAB) caused by chronic bladder outlet obstruction (BOO). Methods BOO was created in 6‐week‐old male C57BL/6 mice using surgery to loosely place a silver jump ring around the bladder neck of each mouse. Micturition behavior (assessed with a metabolic cage) and cystometry were used to evaluate bladder function at 8 and 16 weeks after BOO. Following completion of the functional studies, the bladders of the mice were excised, weighed, and subjected to histological analysis. Results Micturition behavior analysis showed that mice subjected to BOO for 16 weeks had a lower frequency of micturition (7.3 ± 1.1 vs 12.5 ± 3.0 times/d, P < .05) and volume per void (106.0 ± 0.1 vs 133.9 ± 3.2 μL, P < .05) than mice subjected to BOO for 8 weeks. Cystometry revealed that mice subjected to BOO for 16 weeks had lower baseline pressure (8.4 ± 0.6 vs 14.0 ± 0.7 cmH 2 O, P < .01) and micturition pressure (13.9 ± 1.1 vs 42.8 ± 1.7 cmH 2 O, P < .05) than mice subjected to BOO for 8 weeks. BOO caused progressive increases in bladder mass and collagen deposition over time. Conclusions We successfully established a novel mouse model of UAB using surgery to place a silver jump ring loosely on the bladder neck. BOO initially induced bladder overactivity but subsequently resulted in UAB due to deterioration of detrusor smooth muscle contractility and progressive deposition of collagen in the bladder wall.